plasma membrane

slides 15-21

plasma membrane

Boundary around the cell that controls what enters and leaves

4 plasma membrane components

PCGP-”please come get pizza”

1.phospholipids

2.cholesterol

3.glycolipids

4.proteins

4 functions of plasma membranes

1. communicate

2. intercellular connection (cells connect)

3. physical barrier

4. selective permeability

Physical barrier

Plasma membrane helps separate the cell from its surroundings

Intercellular connection

Connection btw cells

phospholipids

Major component of p.s

cholesterol

comp of p.s

-lipids/steroid

glycolipids

cell membrane stability, cell recognition, signaling, and immune responses.

selective permeability

controls/selects what goes in and out of membrane

-nutrients=ENTER

-waste=EXIT

Phospholipid bilayer

2 parallel sheets

“tail to tail”

Hydrophilic

Water-loving

HEAD

Hydrophilic head

Polar head that interacts with water

POLAR= electric charge

Hydrophobic

Water-hating

-TAILS

Hydrophobic tail

Nonpolar tail that avoids water/ forms the membrane interior

bilayer

2 sheets of phospholipids

3 functions of proteins in plasma membrane

1. enzymes

2. receptors

3. transporters (channels/carriers)

Enzyme

help w chemical rxns

Receptor

receive signals

Transporter

channels/carriers

-helps substance cross membrane

Intracellular fluid

Fluid inside cells

-nucleoplasm

-cytoplasm

Nucleoplasm

Fluid inside the nucleus

Cytoplasm/cytosol

Fluid inside the cell

Interstitial fluid

Extracellular fluid outside cells